Are CH4, CO2, and N2O Emissions from Soil Affected by the Sources and Doses of N in Warm-Season Pasture?

Author(s)

Correa, Darlena Caroline da Cruz ^[1] ; Cardoso, Abmael da Silva ^[1] ; Ferreira, Mariane Rodrigues ^[1] ; Siniscalchi, Debora ^[1] ; Toniello, Ariana Desie ^[1] ; de Lima, Gilmar Cotrin ^[1] ; Reis, Ricardo Andrade ^[1] ; Ruggieri, Ana Claudia ^[1]

Affiliation

^[1] UNESP Univ Estadual Paulista, Fac Ciencias Agr Vet, Dept Zootecnia, BR-14884900 Jaboticabal, SP - Brazil

• Document type: Journal article
• Source: ATMOSPHERE; v. 12, n. 6 JUN 2021.
• Web of Science Citations: 0

Abstract

The intensification of pasture production has increased the use of N fertilizers-a practice that can alter soil greenhouse gas (GHG) fluxes. The objective of the present study was to evaluate the fluxes of CH4, CO2, and N2O in the soil of Urochloa brizantha `Marandu' pastures fertilized with different sources and doses of N. Two field experiments were conducted to evaluate GHG fluxes following N fertilization with urea, ammonium nitrate, and ammonium sulfate at doses of 0, 90, 180, and 270 kg N ha(-1). GHG fluxes were quantified using the static chamber technique and gas chromatography. In both experiments, the sources and doses of N did not significantly affect cumulative GHG emissions, while N fertilization significantly affected cumulative N2O and CO2 emissions compared to the control treatment. The N2O emission factor following fertilization with urea, ammonium nitrate, and ammonium sulfate was lower than the United Nations' Intergovernmental Panel on Climate Change standard (0.35%, 0.24%, and 0.21%, respectively, with fractionation fertilization and 1.00%, 0.83%, and 1.03%, respectively, with single fertilization). These findings are important for integrating national inventories and improving GHG estimation in tropical regions. (AU)

• FAPESP's process: 17/20279-0 - Greenhouse gases emission from bovine excreta of C3 forage and C4 grasses in tropical pastures
• Grantee: Rodolfo Nussio Lumasini
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 15/16631-5 - Management strategies to reduce environmental impacts of beef cattle production systems
• Grantee: Ricardo Andrade Reis
• Support Opportunities: Research Program on Global Climate Change - Thematic Grants
• FAPESP's process: 17/11274-5 - Decomposition of litter and greenhouse gases emission in Brachiaria grasses with increasing nitrogen fertilizer rates
• Grantee: Abmael da Silva Cardoso
• Support Opportunities: Scholarships in Brazil - Post-Doctoral